Been RVing fulltiming for 5 yrs and what goes into the black tank is everything that is suppose to go in there. I use Angle Soft septic safe TP and water. My sensors have always read correctly, I started using the GEO Method and it does work. 1 Cup Calgon and 1 Cup Liquid laundry soap, and every time I dump I always flush, flush and flush, Now I only use the above method approx. once per month and still sensors work great. I do occasionally when flushing out the black tank I pour some dish soap down the toilet and continue with the black tank flush when full pulling the drain you see all the suds come out flush again and done. To each their own but we use the toilet for what its intended for, and never a sensor problem. If you bag it go for it.